Replace the exc muffler end cap with one from an xcw. It still has a spark arrestor but it flows better. An FMF Q silencer is even better. I have one. Sound is reasonable and it has a spark arrestor....

I have owned the same 3 rail trailer for over 30 years. I have pulled it at 80 and 90 mph for hours at a time with 8" tires for years with very few problems. But in the last few years I have had too...